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Method for industrialized reparing cyclopentene

A technology of cyclopentene and cyclopentadiene, which is applied in the field of industrial-scale preparation of cyclopentene, can solve problems such as difficult to realize, and achieve the effect of simple process

Inactive Publication Date: 2003-12-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it is quite difficult to control the selectivity of hydrogenation industrially

Method used

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Embodiment Construction

[0011] The technical scheme and the best embodiment of the present invention are described in detail below.

[0012] Step 1. Preparation of catalyst: 40 kg of nickel acetate is dissolved in 500 kg of deionized water, then reduced with 20 kg of sodium borohydride solution, and the obtained ultrafine powder is coordinated with diphenylethylene phosphine to prepare Catalyst spare.

[0013] Step 2. In the high-pressure reactor of 1000 liters, add 500 liters of technical grade ethanol and 300 liters of newly distilled cyclopentadiene, add 3 kilograms of catalysts, and 1 kilogram of auxiliary agents, such as potassium acetate.

[0014] Step 3. First replace the air in the reactor with nitrogen, then fill it with hydrogen, start the mixer, and start the hydrogenation reaction by raising the temperature. The reaction temperature is controlled at 60 degrees, and the reaction temperature can be controlled by cooling with circulating water, or the reaction temperature can be controlled ...

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Abstract

An industrial process for preparing cyclopentene features use of cyclopentadiene as raw material, alcohol as solvent and metal Ni as catalyst, and includes selective hydrogenation by molecular hydrogen, and rectifying to separate cyclopentene from cyclopentane as by-product and solvent. Its advantages are high purity (98%) and selectivity (95%) and no environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of medicine and pesticide fine chemical industry, and relates to an industrial-scale preparation method of cyclopentene. Background technique [0002] Cyclopentene is an important pharmaceutical and pesticide intermediate. The use of cyclopentene as a copolymerization component of polymers can change the elasticity of copolymerized polymers. The addition of cyclopentene and hydrogen halide to generate halocyclopentane is a key intermediate of pesticides, and its polyhalogenated products are also used in the production of pesticides and medicines. In recent years, medical disinfectants have gradually been replaced by glutaraldehydes from phenols, and the most economical synthesis method of glutaraldehyde is prepared by oxidation of cyclopentene with hydrogen peroxide. There are many preparation methods for cyclopentadiene, such as cyclopentanol is prepared by hydrogenation of cyclopentanone, and cyclopenten...

Claims

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Application Information

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IPC IPC(8): C07C5/05C07C13/08
Inventor 阎圣刚张天坤占敬敬陶寅松田宏哲朱志军
Owner DALIAN UNIV OF TECH
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